Interactive Brokers Group, Inc. — Director's Dealing 2018

Sep 21, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Interactive Brokers Group, Inc. (IBKR)
CIK: 0001381197
Period of Report: 2017-09-20

Reporting Person: Galik Milan (Director, President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-09-20	Class A common stock	P	578	$43.32	Acquired	850329	Direct
2017-12-15	Class A common stock	P	415	$60.40	Acquired	850744	Direct
2018-03-15	Class A common stock	P	348	$72.29	Acquired	926466	Direct
2018-06-15	Class A common stock	P	360	$69.96	Acquired	860566	Direct
2018-09-17	Class A common stock	P	427	$59.01	Acquired	860993	Direct

Footnotes

F1: These shares were purchased on behalf of the reporting person through a dividend reinvestment program, in which the reporting person is a participant. These shares were inadvertently excluded from Form 4 reporting.

F2: This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the amended 2007 Stock Incentive Plan ("Plan"); (b) unvested restricted stock units that were awarded under the Plan; and (c) the cumulative shares purchased through the dividend investment program.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.22 to $43.50, inclusive. The reporting person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (3) - (7) to this Form 4.

F4: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.26 to $60.50, inclusive.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.02 to $72.44, inclusive.

F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.73 to $70.13, inclusive.

F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $59.00 to $59.05, inclusive.

F8: The decrease in securities beneficially owned gives effect to the shares that were withheld for tax purposes related to the May 9, 2018 vesting of restricted stock units awarded under the Plan. This withholding transaction was reported on Form 4, filed with the Securities Exchange Commission on May 22, 2018.